Hi Jeff..I hear you calling...unfortunately I could only recommend one company and that's here in the U.K, so not much use to you but, 'The Clubhouse' has a lot of members in the trade and a large amount of their membership is based in the U.S.A...you might like to try the 'sculpting' forum with your inquiry, you may well get a few suggestions.. http://theclubhouse1.net/
You'll need to register, but if you get the info you need I guess it'll be well worth taking a look.